I use a Fisherman's Friend tin to put the flies I want to keep for memories sake. Fisherman's Friend is a cough drop that comes in an Altoid sized tin. The drops don't taste very good but they do seem to work. I take an old plastic credit card and clip the corners to fit in the box. One of the card's I used was a North American Fishing Club card (just trying to keep the theme). I then use zap a gap to glue 2 strips of double high 1/4 inch wide, 1/16 inch thick foam on the card and place the card in the box. All my ties are on size 10 or smaller hooks so I get about 15 to 20 flies in one box.
Better Loops & Singing Reels
Lee